take turns to do sth 这个句型里“turn”为什么要加S啊?

take turns to do sth造句 take turns doing sth与take turns to do sth 有什么区别?详尽 take turns to do sth.和take turns doing sth.的区别要例句 take turns to do sth.的中文意思 take turns doing somethingtake turns doing sht.& take turns to do sth.有何不同 在给一下例句 take turns to do sth ; of one 's own; want sb.to do sth take turns to do sth和 doing sth用法有什么区别? take turns to do sth/use sth as a model是什么意思?请说中文 take turns to do sth 这个句型里“turn”为什么要加S啊? in turn和take turns to do sth.有什么区别 take turns to do 还是doing take turns to do 的翻译 take turns to do例句如题要中文翻译, 是take turn to do还是 take turns to do? take time to do sth. take trouble to do sth. take turns+do还是to do 还是doing take sth to do sth是什么意思?